I didn't call because they took my number with the explicit intention of contacting me in the event of any problems. I didn't hear from them, had no reason to doubt their confidence, and assumed things were golden (the old "no news is good news").
That's what truly bothered me more than not having it in stock. I failed to clarify that in my original post. I would have really appreciated the call. I really like them, and they've been very pleasant to me, so I don't want to cancel at all. But I'm just preparing for the worst.